a(n) = 1*t(n) + 2*t(n-1) + ... + k*t(n+1-k), where k=floor((n+1)/2) and t is A023533.

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =2a(5) =3a(6) =4a(7) =0a(8) =0a(9) =1a(10) =2a(11) =3a(12) =4a(13) =5a(14) =6a(15) =7a(16) =8a(17) =9a(18) =10a(19) =1a(20) =2a(21) =3a(22) =4a(23) =5a(24) =6a(25) =7a(26) =8a(27) =9a(28) =10a(29) =11